Azalea plant named ‘YBAZ-1892’

ABSTRACT

A new and distinct cultivar of  Azalea  plant named ‘YBAZ-1892’, characterized by its dark green-colored leaves that do not abscise during the cooling and forcing periods; uniform, outwardly spreading and mounding plant habit; freely branching habit; uniform and freely flowering habit; white-colored flowers with occasional red purple-colored flecks; double flower form; and excellent postproduction longevity with plants maintaining good flower substance for about four to five weeks in an interior environment.

Botanical designation: Rhododendron hybrida.

Cultivar denomination: ‘YBAZ-1892’.

BACKGROUND OF THE INVENTION

The present Invention relates to a new and distinct cultivar of Azalea plant, botanically known as Rhododendron hybrida, an evergreen greenhouse-forcing type Azalea, and hereinafter referred to by the name ‘YBAZ-1892’.

The new Azalea plant is a product of a planned breeding program conducted by the Inventor in Alva, Fla. The objective of the breeding program is to create new Azalea varieties having uniform plant habit, profuse and uniform flowering response, dark green foliage, good foliage retention during the cooling and forcing periods, resistance to Cylindrocladium and excellent postproduction longevity.

The new Azalea plant originated from a cross-pollination made by the Inventor in January, 1995, in Alva, Fla., of the Azalea ‘Party Favor’, disclosed in U.S. Plant Pat. No. 10,050, as the female, or seed, parent with a proprietary selection of Azalea identified as code number 93C-043-018, not patented, as the male, or pollen, parent. The new Azalea was discovered and selected by the Inventor as a single flowering plant within the progeny of the stated cross-pollination in a controlled greenhouse environment in Alva, Fla. in May, 1999.

Asexual reproduction of the new Azalea plant by terminal cuttings taken in a controlled environment in Alva, Fla. since November, 1999, has shown that the unique features of this new Azalea are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the new Azalea have not been observed under all possible environmental conditions. The phenotype may vary somewhat with variations in environment such as temperature and light intensity without, however, any variance in genotype. The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘YBAZ-1892’. These characteristics in combination distinguish ‘YBAZ-1892’ as a new and distinct Azalea cultivar:

-   -   1. Dark green-colored leaves that do not abscise during the         cooling and forcing periods.     -   2. Uniform, outwardly spreading and mounding plant habit.     -   3. Freely branching habit.     -   4. Uniform and freely flowering habit.     -   5. White-colored flowers with occasional red purple-colored         flecks.     -   6. Double flower form.     -   7. Excellent postproduction longevity with plants maintaining         good flower substance for about four to five weeks in an         interior environment.

Plants of the new Azalea differ from plants of the female parent, ‘Party Favor’, in the following characteristics:

-   -   1. Plants of the new Azalea have double flowers whereas plants         of ‘Party Favor’ have semi-double flowers.     -   2. Flowers of plants of the new Azalea are white in color         whereas flowers of plants of ‘Party Favor’ are dark pink in         color.

Plants of the new Azalea differ from plants of the male parent selection in the following characteristics:

-   -   1. Flowers of plants of the new Azalea have fewer petaloids than         flowers of plants of the male parent selection.     -   2. Plants of the new Azalea have white-colored flowers whereas         plants of the male parent selection have light coral-colored         flowers.

Plants of the new Azalea can be compared to the plants of ‘Irish Lace’, disclosed in U.S. Plant Pat. No. 11,187. In side-by-side comparisons conducted in Alva, Fla., plants of the new Azalea differed from plants of ‘Irish Lace’ in the following characteristics:

-   -   1. Plants of the new Azalea were more vigorous and denser than         plants of ‘Irish Lace’.     -   2. Plants of the new Azalea had double white-colored flowers         whereas plants of ‘Irish Lace’ had single to semi-double         hose-in-hose greenish white-colored flowers.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying colored photographs illustrate the overall appearance of the new Azalea plant. These photographs show the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description, which accurately describe the colors of the new Azalea plant.

The photograph on the first sheet comprises a side perspective view of a typical flowering plant of ‘YBAZ-1892’.

The photograph on the second sheet is a close-up view of a typical flower of ‘YBAZ-1892’.

DETAILED BOTANICAL DESCRIPTION

The aforementioned photographs and following observations and measurements describe plants grown in Alva, Fla. with three plants per 15-cm containers, in a polypropylene-covered shade house during the late spring and under commercial production conditions. During the production of the plants, day temperatures ranged from 13° C. to 37° C. and night temperatures ranged from 0° C. to 26° C. Plants were pinched at planting, pinched a second time about twelve weeks later and then pinched a third time about twelve weeks after the second pinch. After sufficient flower bud development, plants were cooled at 3° C. to 5° C. for four weeks to break flower bud dormancy. Plants were subsequently forced into flower under commercial production conditions in a polyethylene-covered greenhouse. Plants used for the photographs and description were one year old. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2007 Edition, except where general terms of ordinary dictionary significance are used.

-   Botanical classification: Rhododendron hybrida ‘YBAZ-1892’. -   Commercial classification: Evergreen greenhouse-forcing type Azalea. -   Parentage:     -   -   Female, or seed, parent.—Rhododendron hybrida ‘Party Favor’,             disclosed in U.S. Plant Pat. No. 10,050.         -   Male, or pollen, parent.—Proprietary selection of             Rhododendron hybrida identified as code number 93C-043-018,             not patented. -   Propagation:     -   -   Type.—By terminal vegetative cuttings.         -   Time to initiate roots, summer.—About five weeks at             temperatures of 24° C.         -   Time to initiate roots, winter.—About six weeks at             temperatures of 24° C.         -   Time to produce a rooted young plant, summer.—About nine             weeks at temperatures of 24° C.         -   Time to produce a rooted young plant, winter.—About eleven             weeks at temperatures of 24° C.         -   Root description.—Fine, fibrous, and white in color.         -   Rooting habit.—Freely branching; moderately dense. -   Plant description:     -   -   Plant form and growth habit.—Perennial, evergreen; uniform,             outwardly spreading and mounding plant habit; broad inverted             triangle; moderately vigorous growth habit; densely             foliated; full and bushy plant form; uniform and freely             flowering habit with numerous double flowers per plant.         -   Branching habit.—Freely branching habit with about four             primary lateral branches develop after the initial pinch             (removal of terminal apex); numerous secondary and tertiary             branches develop after the sequential second and third             pinches.         -   Plant height, soil level to top of flowers.—About 27.5 cm.         -   Plant diameter, area of spread.—About 41.5 cm.         -   Lateral branch description.—Length: About 22.5 cm. Diameter             at base: About 4 mm. Internode length: About 1.5 cm.             Strength: Strong. Texture, developing: Pubescent, fine brown             hairs. Texture, mature: Woody; pubescent, fine brown hairs.             Color, developing: Close to 144A. Color, mature: Close to             165A.         -   Foliage description.—Arrangement: Alternate, single. Foliage             retention: Very good foliage retention on plants of the new             Azalea that have been in a box for six weeks during the             cooling treatment. Length: About 4.9 cm. Width: About             2.7 cm. Shape: Mostly elliptic. Apex: Mucronate, acute.             Base: Attenuate. Margin: Entire. Venation pattern: Pinnate.             Texture, upper and lower surfaces: Pubescent; leathery,             tough. Color: Developing and fully expanded leaves, upper             surface: Darker than 147A; venation, darker than 147A.             Developing and fully expanded leaves, lower surface: Close             to 147B; venation, close to 146A to 146B. Petiole: Length:             About 1.1 cm. Diameter: About 3 mm. Texture, upper and lower             surfaces: Pubescent. Color, upper and lower surfaces: Close             to 144A to 144B. -   Flower description:     -   -   Natural flowering season.—Spring after sufficient cool             period. If forced, plants typically flower about one month             after a four-week cooling treatment; relatively rapid             flowering response.         -   Flower arrangement and appearance.—Flowers arranged singly             at terminals with usually about three flowers per apex;             uniform and freely flowering habit, flowers face upward or             outward.         -   Flower appearance.—Flowers rotate and rose-like; double             flower form with a single outer whorl of five petals and             four to five inner whorls of petaloids (transformed             reproductive organs).         -   Postproduction longevity.—Excellent postproduction             longevity; under interior conditions, plants maintain good             flower substance for about four to five weeks; flowers             persistent.         -   Fragrance.—None detected.         -   Flower diameter.—About 6.9 cm.         -   Flower depth.—About 3 cm.         -   Flower bud (before showing color).—Length: About 1.3 cm.             Diameter: About 6 mm. Shape: Ovoid. Color: Between 146B and             144A.         -   Petals/petaloids.—Arrangement: Double flower form; one outer             whorl of five petals and about four to five inner whorls             each with about five imbricate petaloids; petals and             petaloids fused at the base; petaloids variable in size and             shape. Petals: Length: About 3.5 cm. Width: About 3.5 cm.             Petaloids, largest: Length: About 3.2 cm. Width: About             2.75 cm. Shape, petals and petaloids: Beyond fused base,             roughly spatulate to orbicular with rounded apex. Margin,             petals and petaloids: Entire; undulate and ruffled. Texture,             petals and petaloids, upper and lower surfaces: Smooth,             glabrous; velvety. Color, petals and petaloids: When             opening, upper and lower surfaces: Close to NN155C to             NN155D. Fully opened, upper and lower surfaces: Close to             NN155C to NN155D; occasional random flecks, close to 61B.         -   Sepals.—Arrangement: Five in a single whorl, fused;             subtending the petals. Length: About 3 mm. Width: About             2.5 mm. Shape: Rounded deltoid. Apex: Acute. Base: Fused.             Texture, upper and lower surfaces: Pubescent. Color, upper             surface: Close to 144A. Color, lower surface: Close to 146A.         -   Peduncles.—Length: About 2.1 cm. Diameter: About 2 mm.             Angle: Mostly upright. Strength: Flexible; strong. Texture:             Pubescent. Color: Close to 144A.         -   Reproductive organs.—None observed, stamens and pistils             transformed into petaloids.         -   Seed/fruit.—Seed and fruit development have not been             observed. -   Weather/temperature tolerance: Plants of the new Azalea have been     observed to be very tolerant to rain and wind. Plants of the new     Azalea have been observed to tolerate temperatures from about 0° C.     to about 38° C. -   Disease/pest resistance: Plants have not been observed to be     resistant to pathogens and pests common to Azaleas. 

1. A new and distinct cultivar of Azalea plant named ‘YBAZ-1892’ as illustrated and described. 